【鼠】安卓学习杂记（十九）——Android之Dialog之单选对话框（一）

一、效果图（不带确定按钮）

二、代码（着重看核心代码——Builder构建器创建）

package com.example.administrator.app_dialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    Button btn1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化视图0
        initView();
        //设置点击事件0
        myClick();
    }
    //初始化视图1
    private void initView() {
        btn1 = findViewById(R.id.btn1);
    }
    //设置点击事件1
    private void myClick(){
        btn1.setOnClickListener(this);
    }
    //设置点击事件2
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn1:
                //预先创建菜单数组
                final String[] items = {"菜单一","菜单二","菜单三","菜单四","菜单五",};
                //创建对话框——Dialog核心代码
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                //设置标题
                builder.setTitle("这是标题");
                //设置菜单,参数1：选项；参数2：默认被选中项，传索引；参数3：点击事件
                builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which){
                            case 0:
                                Toast.makeText(MainActivity.this, "菜单一被选中", Toast.LENGTH_SHORT).show();
                                break;
                            case 1:
                                Toast.makeText(MainActivity.this, "菜单二被选中", Toast.LENGTH_SHORT).show();
                                break;
                            case 2:
                                Toast.makeText(MainActivity.this, "菜单三被选中", Toast.LENGTH_SHORT).show();
                                break;
                            case 3:
                                Toast.makeText(MainActivity.this, "菜单四被选中", Toast.LENGTH_SHORT).show();
                                break;
                            case 4:
                                Toast.makeText(MainActivity.this, "菜单五被选中", Toast.LENGTH_SHORT).show();
                                break;
                        }
                    }
                });
                //创建对话框
                builder.create();
                //显示对话框
                builder.show();
                break;
        }
    }
}